ECN221 Exam Definitions Questions and Answers with Verified
Solutions | Latest 2026 Update
Q: interval
Answer:
margin of error
Q: the confidence interval gets ______ if the confidence level ___
Answer:
wider, increases
Q: When the population SD is _____ we substitute the ______ in its place to
calculate the _______
Answer:
unknown, sample SD, standard error of the mean
Q: ______ errors can occur as a result of a questionnaire that contains ambiguous
questions
Answer:
non sampling
, ECN221 Exam Definitions Questions and Answers with Verified
Solutions | Latest 2026 Update
Q: the larges the SD for the normal probability dist results in
Answer:
a fatter curve that is more spread
out around the mean and not as tall
Q: the _____ probability is bell-shaped and symmetrical
Answer:
Normal
Q: as the size of the sample increases
Answer:
the standard error of the mean becomes smaller
Q: what is the mean of the standard uniform dist
Answer:
.5
, ECN221 Exam Definitions Questions and Answers with Verified
Solutions | Latest 2026 Update
Q: if a study is set up in a way that a sample of people is surveyed to determine
whether they have
Answer:
ever used a particular product, the likely probability dist that would describe the
random
variable, the number who says yes, is a: binomial dist
Q: A ________ for the mean is an interval estimate around a sample mean that
provides us with a
Answer:
range of where the true population mean lies. confidence interval
Q: When calculating a confidence interval for the mean using a sample size of 30 or
more with a
Answer:
known population standard deviation, the ________ is used normal dist
Solutions | Latest 2026 Update
Q: interval
Answer:
margin of error
Q: the confidence interval gets ______ if the confidence level ___
Answer:
wider, increases
Q: When the population SD is _____ we substitute the ______ in its place to
calculate the _______
Answer:
unknown, sample SD, standard error of the mean
Q: ______ errors can occur as a result of a questionnaire that contains ambiguous
questions
Answer:
non sampling
, ECN221 Exam Definitions Questions and Answers with Verified
Solutions | Latest 2026 Update
Q: the larges the SD for the normal probability dist results in
Answer:
a fatter curve that is more spread
out around the mean and not as tall
Q: the _____ probability is bell-shaped and symmetrical
Answer:
Normal
Q: as the size of the sample increases
Answer:
the standard error of the mean becomes smaller
Q: what is the mean of the standard uniform dist
Answer:
.5
, ECN221 Exam Definitions Questions and Answers with Verified
Solutions | Latest 2026 Update
Q: if a study is set up in a way that a sample of people is surveyed to determine
whether they have
Answer:
ever used a particular product, the likely probability dist that would describe the
random
variable, the number who says yes, is a: binomial dist
Q: A ________ for the mean is an interval estimate around a sample mean that
provides us with a
Answer:
range of where the true population mean lies. confidence interval
Q: When calculating a confidence interval for the mean using a sample size of 30 or
more with a
Answer:
known population standard deviation, the ________ is used normal dist
